A relief valve and a hose device for dust collectors, a dust collector and a method for operating a dust collector

Abstract

The invention relates to a relief valve (100) for portable, industrial dust collectors. It has actuating means (102, 104) for actuating the valve (100) between a closed position and an open position. According to the invention, the valve further includes retaining means (107) for maintaining the valve in the open position. The invention also relates to a hose device for a cleaner of a dust collector a dust collector. The hose device is arranged such that it covers the bottom of the grid means in the cleaner when the dust collector operates and falls down when the vacuum in the dust collector is released. The invention further relates to a cleaner, to a dust collector, to a grinding machine and to a method for operating a dust collector. These are in conjunction with the relief valve and / or the hose device. The invention also relates to a dust collector with cleaner means (1, 2), a relief valve (100, 400) and an inlet valve (12) and synchronization means arranged to govern that the actuation of the inlet valve (100, 400) is synchronized with actuation of the relief valve (12).

Description

FIELD OF INVENTION[0001]The present invention in a first aspect relates to a relief valve for portable, industrial dust collectors including actuating means for actuating the valve between a closed position and an open position, and which valve in its closed position is arranged to be exposed to vacuum pressure on one side of the valve and a higher pressure on the other side. It also relates to a dust collector provided with cleaner means and having a relief valve.[0002]In a second aspect the invention relates to a hose device for a cleaner having a bottom with a grid means and being intended for a dust collector.[0003]And in a third aspect, the invention relates to methods for operating a dust collector having an inlet, a cleaner means, an outlet and vacuum generating means providing an air flow path between the inlet and the outlet across the cleaner means and further having a relief valve arranged in the air flow path between the cleaner means and the vacuum generating means, whi...

AI Technical Summary

Benefits of technology

The technical effect of this patent is to improve the performance of vacuum relief valves for dust collectors. Specifically, it aims to better control the dumping of dust into the bag, prevent filters from getting clogged by dust, and enhance the efficiency of automatic blow cleaning of filters using pressurized air. Additionally, it also strives to enhance the cooperation between the cleaner and its dust bag for easy emptying.

Problems solved by technology

However, according to conventional technique, the operator needs to turn off the machine before checking the amount of dust inside the cyclone part.

Shutting off a large dust collector only to check the dust amount takes several minutes, and is an unwanted interruption for professional grinder operators.

It is an unwanted downtime.

However, not knowing how much dust there is in the cyclone during grinding is a problem.

If too much dust has been accumulated at shutting off the dust collector also creates a problem.

The weight of the concrete dust that falls down into the bag, when no vacuum is present, may tear the bag apart, and spilled dust is the fact.

Cleaning up the dust is unwanted downtime.

Another problem is that if a lot of dust has accumulated inside the cyclone, it will the gradually be sucked into the filter part, resulting in clogged filter and unwanted downtime for the operator.

A third problem, in particular for dust collectors which are equipped with pressurized air automatic blow cleaning system for filters, is that during vacuum, pressurized air has trouble to overwin the vacuum through the filter, resulting in poor automatic filter cleanings.

A still further problem is related to the emptying of the dust into the dust collecting bag beneath the cyclone.

If the net is too fine, the dust will have difficulty getting through the net an usually gets stuck inside the cyclone.

If, on the other hand, the net is to sparse, there is a risk that the plastic dust collector bag will get sucked up through the net into the inside of the cyclone and prevent emptying by that.

A still further problem relates to shortcomings in prior art regarding the clean-blowing of the cleaner means when using an inlet valve for access of pressurized air to be supplied to the dust collector.

Automatic relief valves have either uncontrolled and too short opening time, or if better controlled, they are too big for neat installation on a portable, industrial dust collector.

Known manually operated vacuum relief valves have uncontrolled opening time, usually too short, less than a second.

However, the opening time is not sufficient for dust to get dumped from the cyclone into the bag.

The opening time is also too short to blow the filter clean by a pressurized air automatic cleaning system.

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